I was lucky enough to pick up a few of these a long while back and I have a limited number available for OF members. These are genuine Omega Speedmaster new-old-stock early crowns with the flat foot logo and exact correct size of 6.7mm diameter x 3.8mm height and with 24 teeth. These are not the later service ones for the Railmaster or ones of slightly incorrect size you more usually see for sale but genuine early 60's crowns only for the Speedmaster. According to MO these are correct for all c.321 reference Speedmasters. Condition is excellent for 50+ year old items and are unused/NOS. The price each is £350 gbp net to me. Worldwide tracked shipping is included in the price. (I might consider trades for Speedmaster or SM300 parts too.) Cheers!